Use of dallas keys / ibuttons

We have a bespoke epos system developed in house running on desktop pc's. At the moment users authenticate themselves by typing in a 4 digit pin number. We would like to use something like dallas keys (ibuttons) to do this instead. My question is what's to stop someone simply opening up notepad and pressing the dallas key to the reader to get the 16 digit sequence? Or into another text field of the epos system. My understanding is that it just provides a stream of characters just like a keyboard. Anyone had any experience with these?Reply With Quote